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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9979dd7eaf61047a1d51294b5767ae602e33e0e36ad6a6fdad75909b9d6e46' 
  AND token = 'mXamAwYpXj5JfQroivKfGxzEjvmDH6r0HU+5j526x0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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