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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5cfdf2deb5c1e353eb828aef7cee55a18b82be5a2c4f00e4c48efbf0ce7c45' 
  AND token = 'VvN+zoGRHyGM7gbqLGcswaDe0yVUVT8mq8OcAeVT+70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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