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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11feb6dcd227190dc3bee24496922204e98302554a97a93d8c6b16d107925a15' 
  AND token = 'amkDhFU6xQuE43JOfsNqf1VOzRSkBW3Q+IBcA4b77wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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