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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d84d4bac92720fe54755d489bd459411919c69b6095c9fc1e0eb6bd16964214' 
  AND token = 'EF/Tu3OTjOHqaNDWPnB/6FcpSKq9aSxUvQ226Jokj7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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