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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e39a60488b6d614d7a6c4658c2849c191374ce03cb1aa1451f2c8d34077dba' 
  AND token = 'wXKBK2ikguL4zvLAMPQrXPMW6ROYY3X2cLMq1N0SMCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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