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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66de8ac1f84a15b4b7b5ffc7a64943c3f76e7d29e2005205dfc01e291890aee' 
  AND token = 'ckNYhXdWzew5DDel9WAxvU2TcOuuuryZxsPkSSf0Sr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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