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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8252c53125c1cd6c2eaff2f6f67e3e9231a79d286f395f7aa96983175c19bb5' 
  AND token = 'tgaZdtIQrYrP8CwUZOy4iw7nGLC7mmmxJe22AHdHCqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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