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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0620828cabab6a7f61bee1697dba2533b35a667ea22d576fc69f5c9d49fdba45' 
  AND token = 'ZBKhHmnw6imO1MxLBpE1lWq9nBMkSlB7VdrZLTmM8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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