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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2ebe82a5a4cd247970229c1e59092bb99d2ef6cdfa9f70add40e075bbebe64' 
  AND token = 'eIh51P3OlMyW6naUe9ED7v6XSgRPo5UlUqVrMQ5AOkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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