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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f143192d7564a69e2f205079e0b70cfb285726bc8c71a976f2d6bc7404f048f' 
  AND token = '03aP6uZEI3G0ZfbNsg/OyUNB2UWashtr7onueuEhzKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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