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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567bcab5fc32cfc82b943cd68812a5a7f0340ad5600b2eaade0551aab213ab49' 
  AND token = 'sxTKQ6iNK0YOPG07GJo4B8XtFfo8E7VKsCymHA8W63g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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