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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ef014646a4d078bc4d57ea0a84ec7c3a1ef373327c6633c6c7bd784dc955c0' 
  AND token = 'XdsGl0OwFXhJSgWeXvQU0n5xVpsJvyaYm5qgcQXu2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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