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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeed5f5c781ee415e2298fe6e6fee2ad0769bdf239dff595072018bb6e0d76e7' 
  AND token = 'awPSOVN74ZGudTVS7f4W2RoDwWq9lKEBweFoYwgLolk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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