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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e037420a4dc309e968b1206d5a02965350d99a956cda1181ea29174cf959662' 
  AND token = '9M/LXWLpsozCYtLPzNAACMiWbEsSVovfei7y3YnFOZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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