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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9680929204f7b1e2630353af0eef482297406c411de30a00be82ef024a9e8ab' 
  AND token = '38KenE3H8wzM9eeSfJUgoKOqJMOn8wNmdtxUqtwI204=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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