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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71f676b2ef45f85bccd9d223154ddf38a79d0cbcfbe7dcbaa0570ca9e9181a4' 
  AND token = '+WxGUbn0ep5x8Pt3b+v3gSteN/kt441w4djn4BoM14s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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