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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a8b0ba606bad36506983c10532377abb712f16af97b76d9191edafd15735d0' 
  AND token = 'uKNcK0mM3VY3xgY8+L/WzNeOcUoU4M3v+Wn8DtyPlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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