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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9727e7f50240f7cf6f74a2f4c26f09bdec333ac153a2d592f8d1fd7b9ffc694' 
  AND token = 'wrm3xHC2H6aCOo3LmX/BlGFGZ+g8YPNPiRyeMRHmC1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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