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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80602f4108472ea92b3d7212a3a4b12baab710502123ada4cf3ed54bd5a4209' 
  AND token = 'CUcIMsszMmBX033QGmj8EPuRUnW2De2koXzi+Z93Yrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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