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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6556ad30e392fd59f9a7f4c5cc261ab66fe8bb8534bd1dc4631dfc51982f3cc0' 
  AND token = 'LT/R/Rp7r4FfscHqU/h8M+ifCe19FaSULzKzwSM+DXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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