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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed19e4cd01395509a2675f9c386d35b76ba45bebbd7b58080e0a3997653a19cb' 
  AND token = 'f1qG1D+V4AZTGbORQma7//S5ME+ffchWK2kMo6gtSRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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