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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbaaf082080e894837aefa2dc1b924b2ecd16bb1e560722213f049a7c75f360' 
  AND token = 'obxdDy/YsllYo8kK+t2DOVq2jGUcfONuNo+IOj7GO/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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