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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ceddeea3f6d4704110c99aa9462666f2b9dbc97ce0b5871b892bf3812f657a' 
  AND token = '7/6ie3z8YHQo7ee7lZtYkIyiGNygcbqL7bSHBu9b4cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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