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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f1730135b528099488585f60da9542f80af41f3c9f294df19fc5a3a725c442' 
  AND token = '/n2gHx9q0GIGvqhH181L+e54jP0Gwfyy8K14b3rxTlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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