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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa4ca481389c1a108f878fbe6bfd251ce3bad5bc61cfaddb8abe39aab88a7ce' 
  AND token = 'X1YkTSX7lr2Pc3O+4eck05+ZPh5nLlN6jJeVeXhpVo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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