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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6c34f9ebd651e5e62f3abc543058a1e8539dad5d77957a59b2e162b72edd63' 
  AND token = 'KIiztzq5TF+cdT72N8qpdHzk8+l4TMCMAegw727GMS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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