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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf5a98c2f9a153857931949d95834a8d4fca4eed3dad851599a655b6cbd7635' 
  AND token = 'hzlhDPEVYleFbmHcEg5RxAh1bVxnD84K8X/VR9Aqvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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