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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af05ebe38340e11be3bcd89cc3a912e28b3e3c94499d450f0957385d44089fd' 
  AND token = '6Nyfi5DFbLgFcZkOkG28niOwWCuNrOZ0/JCvwRfRFBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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