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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4885a7433abba7f36eedc323f2f0a28987f7a1a43e10aed885454062b560eb4' 
  AND token = 'QH/Y/uiRRRb0j2e+vAdCxLZ5EVXr4u9sKENCHU7TQIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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