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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a76e1a3563fa3472b3b62889f8a9ddec4fd65d8dfcb4fab3e8413b2d535ae6' 
  AND token = 'hG9wa3hyEI7BWp2kcjKS4BgocMk2R3/XvWj2oTVlT98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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