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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39c3c03ab42f31a5662bf2ec8bbdb512a682568ea01165401a444075f37025f' 
  AND token = 'kq8YQW8tKJZ37DK/J62XK9meDKMFvndGXZzDNE/aqZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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