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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b4b624311a5213550f07bdead9fab224a8084a2a7ae5022431bde1045f176' 
  AND token = 'pqc8Cgk6tp8h0ZnyHs5vtzokO6My3o0nIup8CMjTYeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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