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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a38d770be6c3de6ac17b0a4a113fe4a60be357005739072e118d15962294e4a' 
  AND token = '6bDo9Rl8bjecbOtN9AODhTkgSY9kIj8pIb9LGBhHe3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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