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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476efa99277d56918fe6cdf9a80b9d17b46d61cabce37476bdf0a880656e3b62' 
  AND token = 'NzNE938/Gf5qob4uBpE8P9vZprZg24CESwyDHxZ+X0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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