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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987bfbbbfd49a905e6b293dfb4bdb0e65b31839d5471aa583b0aa8fd59aa743d' 
  AND token = 'xx0PUun/Au2fdizjrKqYOjJ4BIMbw3ZTrfOEWoyb+dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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