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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241ad91ecef98651e910205f92d40670fc5bfb6fad9cd129f89a04fdc3cf85fc' 
  AND token = 'ZSz3IL+xKd8vamV7B+PP5CTz1OU43e+ZnvZg69uI0fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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