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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604673921e3a1d1c7165267b55be4152cd41fd455ff3ce73e31a5585b77cba7b' 
  AND token = 'uKvVHf20X9mLQkq/HkdnW3nkwsV5SPq17X7XAQJYlLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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