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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e4c1738cf011907ffb44a10f82393625eae01d0199bb113ec948516561ade4' 
  AND token = '3SxWyehtbAJoPUvWsdodIIFTpKVv2X3ec+DHurcHX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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