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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7debb643b97d91ebd8b01c037a2cbaa254a0972f43091c02da77d66dc649ae7' 
  AND token = 'A6H6qVw2wmytO+1c/bCujZYK05ri7T4knF7mwvsaTJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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