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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4969b0f42558ac317f4ea16888ae0f33d8d327e3621f43773f1a3186bea36910' 
  AND token = 'engy9qyQs44AAgAHERhqD4/kxEMGPq8iIclay8E5G+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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