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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1c56f5fd20ac9ec93928e16f8f3c60cd4d57f9f73e0c4fef7213ad4c7cdbbf' 
  AND token = 'WZrLaXfeifBneSL85NL8yo46d1eOuGbQu0uV39ZgTnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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