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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ae8e9d1eed72a8f4a98311d9235892dfc291edffd1fc882d9bbb3ba5823723' 
  AND token = 'EBIxI0hehkcM/Kc7rk7ExZrD0uemZa7d1OobcIC3tdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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