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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84565abed5680c4338560e235d996f19d6cabea7e56b3d03d80b06717917b50' 
  AND token = 'LkNPxTXbfiJWWrb7Me7zOVZhbBEalh+tyZ7500hzCys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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