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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31744cd449a11828e552316f0928dddd4c0eb7e9b15c732be9f17d7e29235c34' 
  AND token = '92j8cPrAtk0o4uH6tWNYayYKlOOYtqSmN7Vg97QFzrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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