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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68eb4fe9337f1f86ecf624744247ef456c00db2edebf3265defb7bd15b83bc75' 
  AND token = 'c/KxWXkodx21EzWmg+y9QG9wRQevjwXnbdTeXxJ/6xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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