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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18b39fe3924791816c32d22decec69e2349f616522993e7b746ce3021cfff16' 
  AND token = '9BAuhvw4Lg+uSwSeXmcUHipt67OEEKtVtsU3rxgTwAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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