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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4852a8b03ddc44b5685351755815e688cbca99277978728507841dd620f7a6b7' 
  AND token = 'Dxg50acX5/q0qjtH1G/sbK0bD51ApQWX9j0Lb+7RtUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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