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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4498891190b7687d86c9936e73b4ddcebc97dc5c9f75238a7bc2a826c848d6' 
  AND token = '3ZCdOAxSlL4hUAOG0OX1WjjILBi7ZZU5bpZ18x5j5yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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