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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a503d2971b40519c907eba1327810c1e7be55254aabaa42b0b8639897d5813c' 
  AND token = 'gGjKofWcSW7nUSUyC+l+oUUKVDisErstcyLwtL4smWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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