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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944d7a810676f0e3436c36bd3840321938a727fe4c6c11cbec974aca6a0e240d' 
  AND token = 'bQr+OVsx0yxBviq40tBmZg/wDJncjVOqePA5DuJ3E74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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