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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82410b73486226b001fd6b8dea154509f5c8cf62d9e6e9845c2fad13a96a2212' 
  AND token = 'ykDiBSFyOI0vH91Ja4mex1GQrdT0U9w5bLHbhoEECxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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