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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f3f7bad022eb330edc2f780ba9a647a81af77e08d5024de06b5d4d44720eae' 
  AND token = 'BT7eBdqfX+qHLrVwbBXHzJSCJZcSQWHAFZAld+O+MBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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