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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c957cb5a9ad82e51e386bbbbc45abbe93630dcd2d92703833df16b3fef44c1a' 
  AND token = 'NGLXjxU2ahOtyVg95na9sIXYCS4KEZMfAPD77WEyPzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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