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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7bf13c112633a604ebb5c9d3557ed369573eef3ef85f1742ae8cc4e8b35f0f' 
  AND token = 'L5OIHhqH1QrRmOwwGqsZN2IFxLwyhbOm3PP2hRIJG3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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