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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664ee42a64851adda76d75fa0dbad5826b06e3c5591704abb0fb858d970652c8' 
  AND token = 'D0+ETuhw0Xk4LdC0iLwVW4ECA9LjKtOQvEL7x1nUz2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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