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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6db4c4618f8923f11c6d99bdf9117963301648f5842b021d8177c930923462' 
  AND token = 'HmyOY1gESLNYBX6HoppFrPMPRmv5aLrNdkyPTWBfY+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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