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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3b11c59dfeafbc071fc378e8a5d7c7ac7de2e3f9de2c2593e4cb59e459aac5' 
  AND token = '/9ScxotWUhDnDBItHnZkF5DpDnGDR/R1/w5jspvC3+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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