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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051243f85f47633ef6d9228f84f331ee84673d7240b83dbf77b27e846a8dea47' 
  AND token = '6m8S8j1puHbbvs2jT8XF+WVTf02v94c3axfK8ltccBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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