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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06aa70519c9579f3a716de6f4fff3aa7cc87ffab085589c61a21a2cbf913ff8' 
  AND token = 'jZU7M4ddc3BuwAqwNtTOZmCjhYmvchRpLR/SbSUmTNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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