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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932c87153d6eeebcbe0cc2261e8965a5ae62bd652e2b2cb4bd1b8f7d33a50d0f' 
  AND token = 'YZwtAu+5II3AcdGXHjoEh6EE1f6hO/NRJbl0VTSPzq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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