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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13af49f758c81658dc912dda74133e3486d3d40ab3ead1f6df4679adcced6367' 
  AND token = '0bX8M9yW6q3iJQ2dvgu81IJUAo/ZjKWujc7jqynWI0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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