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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9177e0e2209bc29d92b87947af7cd66f63e4281e3d34e5be6051603c279374' 
  AND token = '3J53/utCYiT9V9jVnH4wchbTzlGkQcVu4Vgpy8a5Ooo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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