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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4d894fbe1d7dcf3833b9d50d293f72168e622702671fc36d52037cb2b4e185' 
  AND token = 'e4Noz7luZCtGgoE1e0BQMqyc+rngTImu+7tswI9b3yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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