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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6890a56a7e54b4b6a88e26b54787c05e145e2aa5fbbf9521ead30ec94f9aff' 
  AND token = 'c3mqD7x415iOsQOr8oidImoEb0H+jeAUQNdap7PKIGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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