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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733e201c4f1db266e9648fc3ba99c5876e0b1711654aff90074f98ee70b062ed' 
  AND token = 'vzk6JX0wwuoQjX0+QNs0w81TdFF4SPLM7VPar0MpPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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