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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4592e78f7bfa5eca6a8677a5aa79056130115118b1ed71aeb0bd6939c4e9eeb2' 
  AND token = 'hihCOb4sRdwQLw1q7hOHmH58yhgDkWGNdXpTlx90axk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}