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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a9a7c49afc4df0aa333eec723c9cdbc65fe1371dfecebda3ea3d955826c998' 
  AND token = 'ZK188DpdipOH1ljrB2Ax+UyM7h1Yb5Ke2WZpI5R/hbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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