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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7273b45eccdff933bf3c767c94ebde2feeed49555e8f472b299af1f66b03169' 
  AND token = '9w0JsijyReDF74LaBqX8O3uh0v4t/BdUnQVDgwniyBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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