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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4107e7316a3ff6f1cfa93810c4cee8e1791f57678a3613580b8014bb235f3cdd' 
  AND token = '/RcS5awgswOM01IXkBeBDxC+XacmJtF2i7aahAjeauw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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