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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73963bb674b392ec180b0e5a6cda8e77cbaefbcd0fa4a8d19c1964f49eb083e3' 
  AND token = '4mXJ6pJJAybLX5nlaFgc3XhKDoCMEUbMPSNIKpIybxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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