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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61cd98801d72b55ef72f12188fe80ae2307b5c8ce96d8a8b8e9fc4e12688ccd' 
  AND token = 'lrvmhDLkSZV8k402xeTOBY+K0vKx46IOekyQbWIfQ3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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