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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fff34d8348a5c651665684746f6ae41419fcd1a11e722fe7d929077322fe3a' 
  AND token = 'OIlaix0moRFM3WuUp6ZS8dJHYEfwV5goJ28D6B5RIA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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