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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b3ec171aae583436239400c7b61a129c8f4206b9e5a4a5931e3e0f935b230e' 
  AND token = '0qYG2xgBQNzprTUMuxf8p8Ov6YXPNpXjwuDmMeAVwYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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