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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f89ef260788317b96d052c7df6f7dcdcbec39c05804b5accc22ab6c36898a4e' 
  AND token = '0neiEJ+vafdCKZ8MV86zccRwARDi/kuJUcjN34eLh3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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