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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f78c20a21e80e51cba773f082fb305ef75a78847c2cd82b5292edcb4919b19' 
  AND token = 'Qf3FLX72GYu7g8UFv/bi3AjhgBfplT7JJVrTFlu9VPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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