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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643716b0998e1278b53a7f1383c5a13557a6c74ccf9eea82da9d88b58cfaffc9' 
  AND token = 'J6Qtd8Nb5xLVOQwN9Ofm4MJNgyosNRwsfaqYfSztOcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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