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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2329582b1be65badfa8630fca6b38709f212c87460804388273c4326f8b06a' 
  AND token = 'jbydvHeOXL0sP7gq8IOeg7m2hW+8qQ765d2EUDFLwww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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