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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baff8d3b09e1db6d0dc9c5237a259ee04a4470ef7d44eb4418f7be4e124f4905' 
  AND token = '3I4bHAO/pASuj3jIHxe5FZxfHW1Y1dv75SIOf1kae6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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